using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

class Solution {
    static void Main(String[] args) {
        int n = Convert.ToInt32(Console.ReadLine());
        string[] calories_temp = Console.ReadLine().Split(' ');
        int[] calories = Array.ConvertAll(calories_temp,Int32.Parse);
        Array.Sort(calories);
        var result = 0L;
        var power = 1L;
        for(int i = 0; i < n; ++i) {
            result += power * calories[n - i - 1];
            power <<= 1;
        }
        Console.WriteLine(result);
    }
}